External Auxiliary Battery of 4,000 Mah Made of Aluminium. with USB Output And, & Type C Input & Output. LED Charge Status Indicators & Charger Cable Included. Available in Stylish Colours & Presented in an Individual Kraft Design Box, with Instructions Manual in English & Spanish. Micro USB Input: 5v Dc 1ª Usb Output: 5v Dc 1a The Capacities Shown in All Our External Auxiliary Batteries Are Real, All of Them Incorporating Non-recycled, Grade a Batteries, with a Service Life of at Least 500 Charger Cycles, & Complying with Ce Regulations. In Addition, They Are Manufactured According Rohs Standards, & in Compliance with the Following Safety Requirements: Power Bank Overcharge Protection System. Complete Discharge Protection System, Which Increases the Durability of the Power Bank. Blocking System to Prevent Short Circuits. Constant Charger Transfer System, in Accordance with the Capacity of the Target Device. 4000 Mah. USB Output. Type C Output & Input. Colours: Black, Silver. Minimum Quantity: 10.